Coated steel sheet having zm coating layer and steel sheet component produced therefrom

A zinc alloy coating with controlled cooling and high aluminum and magnesium content forms a multi-layered grain structure, addressing localized corrosion issues in solar mounting systems by preventing complete failure and maintaining corrosion protection.

EP4759951A1Pending Publication Date: 2026-06-17THYSSENKRUPP STEEL EUROPE AG PATENTE PATENT DEPARTMENT
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
THYSSENKRUPP STEEL EUROPE AG PATENTE PATENT DEPARTMENT
Filing Date
2024-12-13
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Zinc-based coatings for steel substrates used in solar mounting systems face localized corrosion in the eutectic zones, leading to mechanical integrity issues and potential failure of the corrosion protection due to localized erosion and detachment of zinc grains.

Method used

A zinc alloy coating with a high coating weight of 200-1000 g/m², containing 0.5-8.0 wt.% aluminum and 0.5-8.0 wt.% magnesium, is applied via hot-dip coating and controlled cooling to achieve a multi-layered grain structure with zinc grains occupying at least 75% of the surface area, slowing crack propagation and preventing spalling.

Benefits of technology

The multi-layered grain structure effectively prevents complete failure of the zinc coating by allowing smaller portions to detach while maintaining corrosion protection, even after mechanical damage, ensuring long-term resistance under corrosive conditions.

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Abstract

The invention relates to a coated steel sheet with a zinc-based coating and a coating weight between 200 and 1000 g / m², which, in addition to zinc and unavoidable impurities, comprises additional elements such as aluminum with a content of 0.5 to 8.0 wt.% and magnesium with a content of 0.5 to 8.0 wt.% in the coating, wherein the zinc-based coating comprises or consists of zinc grains (Z) and eutectic (E). The invention further relates to a steel sheet component manufactured from the steel sheet.
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